Vktech&reg; GUB GS Ultra Light Weight Aluminium Bike Bicycle Seat Post 27.2MM Premium quality seat post at a fantastic price, these are as good as they look Incredibly light and strong, without breaking the bank Type Item: GUB GS ultra-light aluminium alloy seat post Seatpost Diameter: 27.2mm Material: 6061 Alloy T6 heat treating